If the secondary winding of the ideal transformer shown in the circuit of the figure has 40 turns, the number of turns in the primary winding for maximum power transfer to the 2 Ω resistor will be

In the series circuit shown in figure, for series resonance, the value of the coupling coefficient K will be

In the circuit of figure, when switch S1 is closed, the ideal ammeter M₁ reads 5A. What will be ideal voltmeter M₂ read when S₁ is kept open? (The value of E is not specified).

In the following circuit the capacitance varies as C = KQ, where K is a constant equal to 0.5 Farads/Coulomb and Q, the charge on the capacitor in Coulombs. Determine the current through the circuit and sketch the voltage waveform across the capacitor (V_C) for a step input V_i as shown in figure.